Postemergent herbicide

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1. A herbicide that is applied to control weeds after their germination and emergence from the soil; a herbicide that kills plants after they have grown to seedling stage or beyond. See also preemergent herbicide, herbicide, nonselective herbicide, and selective herbicide.


RoundUp is one brand of postemergent herbicide.


Timing of postemergent herbicide application for soybeans.